1. No category

DLLWrapper Manual
Introduction
Thank you for using DLLWrapper, a tool that gives you the ability to use 32 bit DLLs in a 64
bit host environment and vice versa. It allows you to keep on using software and hardware
you bought for a huge pile of money in the past while switching to a 64 bit Windows
operating system for instance even when there are no 64 bit DLLs available to access your
old software or hardware.
The only input that the tool needs is the original DLL that it should wrap and a C header file
describing the interface functions of the DLL. Ideally a suitable header file will have been
delivered by the vendor of the DLL – if this is not the case, you’ll have to write a header file
by yourself by extracting the necessary information from some form of documentation that
should have been provided by the vendor of the DLL at least.
In order to wrap for instance a 32 bit target DLL so that it can be used again in a 64 bit
environment by a host program like the 64 bit version of Matlab for example, the tool will
generate a 64 bit wrapper DLL providing the same functions as the original 32 bit target DLL
as well as a 32 bit wrapper EXE which will link the original DLL and two proxy / stub DLLs for
inter process communication marshalling. When the 64 bit host program loads the wrapper
DLL and starts calling a function provided by the DLL, the function call will be mapped to the
invocation of a COM object method passing the barrier between the 64 bit process
environment of the host application and the 32 bit process environment of the target DLL by
executing the call in the environment of the wrapper EXE as shown below:
64 bit host
<target>_64.dll
32 bit environment
<target>_proxy.dll
<target>_stub.dll
64 bit environment
<target>_32.exe
<target>.dll
For the rest of this document it is assumed that you're able to read (and possibly write) C
header files - if you're not at home in this, you should find someone who is... We'd like to
emphasize that this tool is designed for experts with some programming experience as
deepened understanding of the Windows operating system as well as procedure call and
parameter passing mechanism are vital to achieve a smoothly running wrapper DLL.
Attention: as it is not possible to guarantee for any of a literally infinite number of
combinations that DLLWrapper will generate error-free resulting software, you as the
user are responsible for testing the correct behavior of the generated wrapper DLL in
all of your use cases - we can't take that off your shoulders!
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Installation
Before installing and using DLLWrapper you first have to install some necessary third-party
build tools that DLLWrapper is relying on. All of those tools are available free-of-charge but
due to legal reasons we weren't able to bundle them with DLLWrapper so you have to install
those tools manually before. System requirement for DLLWrapper is a PC with a 64 bit
Windows operating system like Windows Vista, Windows 7 or Windows 8 - it can't be used
on a 32 bit Windows operating system. As it is deprecated we don't support Windows XP 64
bit, too.
At first you should install a version of the free VisualStudio Express Edition from Microsoft's
web site http://www.visualstudio.com/downloads/download-visual-studio-vs - you can use
either the 2010 version (which is the last version that can be installed under Windows Vista)
or the 2012 or the 2013 version of VisualStudio Express. If you already have other editions of
VisualStudio (Professional, Premium, Ultimate) installed, they should work, too, but we can't
guarantee that.
If you've installed the 2010 version of VisualStudio Express, you'll have to install the
Windows
SDK
7.1
from
Microsoft's
web
site
http://www.microsoft.com/enus/download/details.aspx?id=8279, too, (or if you prefer an ISO-Image from
http://www.microsoft.com/en-us/download/details.aspx?id=8442, in which case you'll need
the image GRMSDKX_EN_DVD.iso for the 64-Bit-SDK) as it includes the needed 64 bit
C/C++ compiler and some other tools like the MIDL compiler which are not part of the
VisualStudio 2010 Express Edition (but of the 2012 and 2013 version).
Please note that if you are installing the additional service pack for VisualStudio 2010 from
http://www.microsoft.com/de-de/download/details.aspx?id=23691 (which we recommend
especially if you experience some problems) after installing the SDK, this will accidentally
remove the 64 bit compiler again. You'll then have to reinstall it using the hotfix that Microsoft
provided under http://support.microsoft.com/kb/2519277/en-us for this installation bug.
If you're planning to distribute wrapping DLLs to some other people like colleagues or
customers, you also need to install the installer generator InnoSetup from
http://www.jrsoftware.org/isinfo.php.
After installing DLLWrapper with the respective option checked you'll find some real world
examples in the public document folder in the directory DLL Wrapper Examples (simply
follow the link created in the start menu). We have installed those files in this directory so that
you or other users are able to build the examples even without admin rights. At the moment
the following examples are provided:
Example
K8055D
Description
Wrapper to access Velleman's K8055D /
VM110 USB Multi-I/O-Board from 64 bit
PCSGU250
Wrapper to access Velleman's PCSGU250
oscilloscope / generator from 64 bit
USBAXLA
Wrapper to access USBees AX oscilloscope / logic analyzer from 64 bit
WrapperTestDll Comprehensive test DLL for DLLWrapper
simply writing function parameters into file
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Web site
http://www.velleman.eu/
products/view/?id=404998
http://www.velleman.eu/
products/view/?id=377622
http://www.usbee.com/ax.html
DLL (32 and 64 bit) and
source files included
20.02.2014
Due to legal reasons we couldn't bundle some of the example DLLs with DLLWrapper - if you
like to build them, you'll have to install the respective third-party software from the given web
site first.
Preparing a C header file
As host application with wrapper DLL on the one hand and wrapper EXE with target DLL one
the other hand are running in separate processes with own address spaces, all data passed
to and from the DLL functions has to be copied from one address space to the other.
Fortunately, the Microsoft COM environment provides means to automatically generate code
that will do the necessary coping including packing the data on one side and unpacking it on
the other side for us – the so-called marshalling code. However, the tools generating this
marshalling code need precise information about the size of the memory chunks to be
copied.
If the DLL you’d like to wrap only provides functions with basic parameter and return types
like int, float etc., all the necessary information for the marshalling is already present in a C
header file describing the DLL interface and no modifications to the header file will be
necessary in order to use it with DLLWrapper. If the DLL functions use pointers to pass
arrays to and from the host application by reference, some modifications might be necessary
however in order to provide information about the actual array size. Furthermore
modifications might be necessary if a header file includes some nested headers so that they
can be found by DLLWrapper. If you think that you might need to make modifications to a
header file provided by your DLL vendor, we recommend that you’ll make a local copy of this
header file first before starting to modify it. If your DLL vendor didn’t provide a C header file
for the DLL at all, you’ll have to write one by yourself in order to provide the necessary
information to DLLWrapper by extracting the information from the DLL interface
documentation.
DLLWrapper uses the following default assumptions regarding parameter passing when
parsing a given header file:
1. All non-pointer and non-array parameters (that includes struct and union types)
are pure inputs (this is not an assumption but rather a fact as C passes all first-level
parameters by value) and therefore must be copied only from host application to
target DLL.
2. All pointer parameters effectively (maybe hidden by some typedefs) pointing to basic
data type char are assumed to be C strings with maximal length of MAX_STR+1
(this configuration parameter can be changed and passed via GUI or command line
interface). Furthermore it is considered that the pointer could also be a NULL pointer.
3. All pointer parameters effectively (maybe hidden by some typedefs) pointing to basic
data type unsigned char are assumed to be raw data buffers with maximal length
of MAX_BUF) (this configuration parameter can be changed and passed via GUI or
command line interface, too). Furthermore it is considered that the pointer could also
be a NULL pointer.
4. All other pointers are assumed to point to exactly one object of the referred data type
- that means it is NOT assumed, that pointer types other than in the two cases above
are pointer to arrays by default. Furthermore it is considered that the pointer could
also be a NULL pointer.
5. Arrays with a given size passed as function parameters (which are always passed by
reference in C) are handled as such.
6. If a pointer points to a data type marked as const, it is assumed that this memory will
be read-only for the function it is passed to and therefore it will only be copied from
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host application to target DLL. If a pointer points to a data type NOT marked as const
however, it is assumed that the called function will change the contents of the
memory passed and therefore it will also be copied from target DLL to host
application again after the call.
7. Pointers to memory chunks returned by a DLL function are assumed to be pointing to
statically allocated memory inside the original function.
Especially if the functions described in your header file are using pointers to pass arrays from
and to the host application with types different from char and unsigned char (which is quite
common praxis in C), you’ll have to modify the function prototype in order to provide the
correct information for DLLWrapper (you have to get DLLWrapper to use assumption 5
instead of 4). In case you know from the DLL documentation that function foo is called with
an integer array with a fixed number of 16 elements, you’ll have to change
void foo (int *tab);
into
void foo (int tab[16]);
In case an array has a variable size depending on some other function parameters, you can
change
void foo (int len, int *tab);
into
void foo (int len, int tab[len]);
In the rare case that the size of an array is neither fixed nor can be determent by other
function parameters, a wrapping of this function is not possible with DLLWrapper. If you don't
need the function anyway, you can simply delete it from the header file - otherwise you'll
have a problem now...
For the sake of efficiency it is recommended to add the const modifier to pointer function
parameters that are knowingly not modified by the called function. You should check your
DLL documentation to extract this information as this will reduce the unavoidable overhand
imposed by inter process communication significantly. If you retrieve from the documentation
of your DLL that the function foo does not change the contents of the array tab passed to it
for instance, you should change
void foo (int tab[16]);
into
void foo (const int tab[16]);
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Generating a wrapper DLL
After you have prepared the necessary C header file, you can either use the command line
version of DLLWrapper or a little GUI to generate a wrapper DLL for your given original
target DLL. Both the command line interface and the GUI are described in detail below. In
both cases you can pass an output directory in which the final products should be placed.
For a DLL named <target>.dll with a corresponding header file <target>.h, the following
products will be generated when wrapping a 32 bit DLL:
<target>_64.dll
<target>_32.exe
<target>_stub.dll
<target>_proxy.dll
<target>_reg.bat
<target>_unreg.bat
64 bit wrapper DLL, replacement DLL for 32 bit target DLL
32 bit wrapper EXE, replacement process to host 32 bit target DLL
32 bit marshalling code
64 bit marshalling code
Batch file to register COM objects needs for inter process
communication
Batch file to unregister COM objects
When wrapping a 64 bit target DLL to be called from a 32 bit host application, the
replacement DLL will be called <target>_32.dll while the replacement process will be called
<target>_64.exe.
Please note: if you're using the trial version of DLLWrapper, the successful building of a
wrapper will only be possible for thirty times - afterwards you'll have to buy a full license.
Using a wrapper DLL
After generating a wrapper DLL and the accompanying files the new COM objects realizing
the inter process communication between 64 bit host application and 32 bit target DLL have
to be registered with the Windows COM system. For that you'll have to execute the
generated batch file <target>_reg.bat (or you can choose to directly register the COM objects
after building a wrapper by using the respective GUI or command line option). Please note
that you'll need at least temporary admin rights on your machine for that.
Afterwards the wrapper DLL can be used by a host application by simply copying it to a place
where it can be found by the host application - you can either copy the DLL to the system32
subdirectory of your windows installation (in case it's a 64 bit DLL, otherwise you'll have to
copy it to the syswow64 directory in case it's a 32 bit DLL) or into the directory where the exe
file of the host application is located. Please note that you might need temporary admin rights
on your machine for that. If your host application uses run time linkage instead of load time
linkage it might be possible to provide a path directly pointing to the output directory used by
DLLWrapper so that copying the wrapper DLL to some other directory might not be
necessary at all.
Please note: if you're using the trial version of DLLWrapper, a generated wrapper DLL will
only run for 24 hours after it has been build - afterwards it either has to be rebuild or you
have to buy a full license ;)...
Furthermore it is possible to automatically generate an installation package for the built
wrapper DLL using the corresponding option of the GUI or comand line interface in order to
distributed it to other systems. This feature is not available with the trial version of
DLLWrapper.
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Command line interface
The command line version of DLLWrapper expects the name and the path of a header file
describing the DLL interface to be wrapped as a command line parameter. Furthermore a
number of additional command line options (which can be prefaced by either - or /) are
supported:
H,?
V
O=<path>
B=<path>
D=<path>
L=<path>
I
E
X
R
A
P
C=<size>
U=<size>
a help page
verbose mode, echo all invocations of external tools (useful to investigate
problems with the build process due to failing tool invocations).
output path for products
build path for intermediates (intermediates visible only with full license)
explicit DLL file path and name, necessary if header file name is different
from dll file name or placed in different folder
log file path and name for the wrapping process (will lead to log code
generation in the wrapping process which is very useful to investigate
problems using the generated wrapper DLL).
generate idl file only for manual modifications (possible only with full license)
generate products from existing idl file (possible only with full license)
exchange wrapping direction from 32 -> 64 to 64 -> 32 bit
register products after building
activate logging directly (only together with option R)
build an installation package (possible only with full license)
set the maximal size for character strings (default 1024)
set the maximal size for data buffers (default 1024)
Interactive GUI
The interactive GUI provides the same features as the command line interface version of
DLLWrapper but might offer a more intuitive way of using the tool. Below the "Main" tab of
the GUI is depicted:
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In the "Paths" section of the GUI you can select or enter the path to and the name of the
header file describing the DLL exports, the path to and the name of the target DLL that
should be wrapped, the build path, where the intermediate files should be placed, and the
output path, where the final products should be placed. Note that in the trail version of the
tool, you can't select a build path because all intermediate files will be deleted right away
during the build.
In the "Logging" section of the GUI you can activate the generation of logging code into the
wrapper EXE server which is very helpful in finding problems with wrapped DLL functions
(see the chapter "Troubleshooting" below). Furthermore you can select a path and a name
for the logging file.
In the "Config" section you can change some settings for the wrapping procedure. You can
reverse the wrapping direction to wrap 64 bit DLLs as 32 bit DLLs and you can enable the
registration of the generated wrapper during the build in order to be able to test it directly
afterwards. For the registration you'll need admin rights, however. Furthermore, if registration
is enabled you can activate the logging right away, too.
With a fully licensed DLLWrapper you'll be able to stop the build process after the generation
of the IDL file in order to be able to make manual modifications to it before continuing the
build with an already existing IDL file. Please note that in this case the IDL file is expected to
be located in the sub directory <target>_wrapper\<target>_idl in the build directory, into
which the generated idl file will be placed initially - no different location can be selected.
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Furthermore you'll be able to generate an installation package for the generated wrapper
DLL in order to be able to distribute it to other systems. For this additional feature you'll have
to install Inno Setup as external tool to generate installation packages, however.
Finally you can change the default maximal size for strings (MAX_STR) and buffers
(MAX_BUF) in the "Config" section (see below for an explanation of these values).
In the "Log" tab depicted below you'll be able to see messages produced by DLLWrapper
and the external tools invoked by DLLWrapper like the MIDL compiler and the C++ compiler:
Under the "File" menu you'll find two items to clear all settings or the reload the last settings
that were stored when closing the tool the last time as well as one item to close the tool.
Under the "License" menu you'll find two items to buy or update to a full license for
DLLWrapper. The "Buy license" item will lead you to our web site where you can directly
purchase a full license for DLLWrapper. We'll deliver a license file to you via e-mail after
receiving your payment and you'll be able to upgrade your installed trail version of
DLLWrapper to a full featured version without any limitations by using the "Update license"
item to select the license file you received and saved somewhere in your file system.
Finally under the "Help" menu you'll find one item to open this DLLWrapper user manual in
the *.chm help file format used by recent Windows versions (a link to a PDF version of this
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document can be found in the start menu). Furthermore you'll find a menu item giving you
information about you'll license type (trail or full) and our contact e-mail address.
Limitations
Handle-like function parameters
As DLLWrapper is trying to convert in-process function calls to a target DLL in the same
process environment into out-of-process COM calls with two processes in different
environments, there are some limitations regarding the indirect passing of memory. As there
is no single address space any more between the wrapped target DLL and the host
application, memory addresses passed directly and unchanged from the host application to
the target DLL and vice versa wouldn’t have a useful meaning in the respective other
address space. However there are cases in which it is necessary to pass an unchanged
memory address from the target DLL to the host application if this memory address is used
as a kind of handle for later calls to other DLL functions for instance (see our USBAXLA
example for the USBee AX Oscilloscope / Logic Analyzer, where such a case occurred). In
this case you'll have to change the data type of the respective pointer parameters into
unsigned long (if wrapping a 32 bit target dll) or unsigned long long (if wrapping a 64
bit target DLL). In the USBAXLA example we had to change the following function prototypes
for instance
extern unsigned long *MakeBuffer(unsigned long size);
extern int DeleteBuffer(unsigned long *buffer);
into this
extern unsigned long MakeBuffer(unsigned long size);
extern int DeleteBuffer(unsigned long buffer);
as the pointer returned by the function MakeBuffer is used as a pointer to data but also as
a handle for an allocated buffer which has to be passed to the function DeleteBuffer later
on to free the buffer after usage.
In order to be able to access contents at the memory address passed by the target DLL in
case that the address is not used as a handle exclusively but also use as a memory buffer
for instance (as in the USBAXLA example), two additional generic function will always be
generated into the wrapper DLL which can be used to directly read and write memory in the
address space of the target DLL:
void <target>_ReadMem (void *buffer, unsigned long addr,
unsigned long size);
void <target>_WriteMem (unsigned long addr, void *buffer,
unsigned long size);
At this point the compatibility of the wrapper DLL with the target DLL is of course not 100 %
and programs or scripts using the DLL functions that have been written for a 32 bit host
environment will have to be adopted in this case. Attention: please take special care when
using the above function to read and / or write memory in the target DLLs address space that
you are providing a valid address and a valid length - if the memory access will fail due to
invalid address and / or length, the wrapper EXE server will crash and the ReadMem /
WriteMem function will return without result after an inter process communication timeout.
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Memory returned by function
In some cases DLL functions are returning pointer to memory chunk allocated by the called
function itself either statically (as global but function-local memory) or dynamically (from
some form of memory heap). Such a pointer could be returned as a function result or by
changing a pointer which address has been passed to the function as an argument (second
level pointer or pointer to pointer). DLLWrapper assumes by default that all memory pointers
returned by a function are pointing to statically allocated memory and it will allocated the
same amount of memory statically in the replacement DLL as there is no way for
DLLWrapper anyway to find out when and how dynamically allocated memory should be
freed again.
In case of a function returning statically allocated memory it is again essential to provide
precise information for DLLWrapper about the size of the memory returned. Please note: if
this information is wrong, DLLWrapper might try to copy data beyond a valid memory chunk
with might lead to an access violation in the wrapper EXE leading to a crash of it and a
timeout of the inter process communication with the wrapper DLL. Returning a C character
string like in the case
char *foo(void);
is rather uncritical as the wrapping code can determine the length of the string by searching
the terminating null character - it only has to be insured that the configuration parameter
MAX_STR is large enough for all possible strings passed as otherwise some strings might be
truncated (but no access violation will occur). Return pointer to a data buffer like in the case
unsigned char *bar(void);
requires special care as the configuration parameter MAX_BUF has to be set exactly to the
size of the returned buffer - if it's set to smaller value, the returned buffer will be truncated, if
it's set to a larger value, an access violation might be the result. In general it's better to
rewrite the function prototype to
unsigned char (*bar(void))[512];
in case the buffer is 512 bytes in size for instance. This is mandatory anyway for functions
returning arrays of other types than char and unsigned char as DLLWrapper will assume
that a pointer returned by the function will only point to a single type instance by default.
If a DLL function is actually returning dynamically allocated memory, the approach described
in the section above has to be used and the pointer values should be passed unchanged
directly from one a address space to the other as they are used as handles, too. In case
such memory chunks were allocated from the default Windows process head (or a DLL
function expects a memory chunk that has been allocated on the default process heap and
will free it during the function call) two additional generic function will always be generated
into the wrapping DLL which can be used to directly allocate and free memory on the default
process heap in the address space of the target DLL:
unsigned long <target>_AllocMem (unsigned long size);
void <target>_FreeMem (unsigned long addr);
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Unions
As there is usually no generic way to find out which element of a union is the "valid" one at a
given point of time, unions can only be passed as chunks of memory that will be copied from
one address space to the other without further marshalling. This implies that using unions
with pointers in it will not work as the memory the pointer is pointing to is itself not copied and
the value of the pointer will be of no meaning in the other address space. This is only a minor
limitation as union are rarely used as DLL function parameters.
Bitfields
Bitfields are passed from one address space to the other simply by copying the contents of
the memory cells they occupy. There is no guarantee that the bit order is compatible in this
case (normally it should be), but using bitfields as DLL function parameters is no good idea
anyway because there placement is dependent on the programming language and even on
the compiler version use to build the original DLL.
Troubleshooting
If you experience trouble with the installation of DLLWrapper, please read the installation
section of this manual carefully as it includes some necessary preconditions for a successful
installation of the tool. Especially you should be sure that you've installed all required
external tools before installing DLLWrapper itself.
If you encounter problems during the building of a wrapper DLL, please read the messages
in the log tab of the GUI or on the console output carefully as they may give you some vital
hints on what's going wrong. Typical sources for problems during the build of a wrapper DLL
are wrong path entries made either during the installation or during the build or missing read
and write access rights on selected folders.
If you experience trouble when trying to use a wrapper DLL, you should first check that the
build wrapper DLL has actually been placed in a folder were it can be found by the host
application (if not, the host application should issue a warning that for instance the file
<target>_64.dll could not be located). If you're getting error message boxes from the wrapper
DLL like "CoCreateInstance failed with error: 800...", you might have forgotten to register the
COM objects using the <target>_reg.bat batch file (which requires admin rights and will fail
without further notice, if you don't have them).
If you still have problems building or using a wrapper DLL, the tool provides some helpful
diagnostic features that you can use to solve even complicated issues:
Verbose mode
The command line version of DLLWrapper has a command line switch (-V) to activate
"verbose mode" in which all command invocations are echoed to the standard console
output. If you're already using the command line version of DLLWrapper, simply add this
option to your command line and hopefully you'll be able to find out which external tool is not
running as it should and why. If you're using the GUI version of DLLWrapper, you'll find the
command line information which is used by the GUI at the beginning of the messages
displayed in the "Log" tab. You can copy and paste this command line setting to a console
window and add the verbose mode command line switch there.
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Logging code
You can enable the generation of logging code into the wrapper EXE. This code will not be
active by default but can be activated by writing a registry key specific to the wrapper DLL.
This can easily been done either for testing purposes right after building the wrapper DLL by
using the respective GUI option or the command line option A or later maybe even on a
different target machine by calling the generated <DLL-Name>_reg.bat batch file with the
option /Logging to switch it on or without the option to switch logging of again.
If logging code has been generated and the logging feature has been activated every
function invocation made through the generated wrapper EXE server to the original target
DLL is logged with the values of all function parameters passed and the return value given
back. This can be very helpful in order to find problems that occur when calling specific
wrapped functions through the wrapper DLL from a 64 bit host application for instance. Of
course this logging of every single function call can slow the DLL functions and possible the
whole system down quite significantly so the logging feature should be deactivated again
after finding a problem. Be aware that there is no size limit for the logging file right now which
means that it will grow and grow until being deleted manually or until there is no space left on
the storage device.
Service and Support
If the troubleshooting information above didn't help we'll provide 90 days e-mail support with
48 hours maximal response time for all customers that purchased a full license of
DLLWrapper regarding installation and building issues after date of purchase - that means
you can get quick, free-of-charge help if DLLWrapper is not installing or running as it should.
Please understand that we can't provide support of any kind for the free-of-charge trail
version of DLLWrapper.
However, we can NOT provide free support for wrapping a certain 32 bit DLL that you like to
call from a 64 bit host of course, as there are trillions of possible use cases which are all
individual and might lead to specific problems that have to solved individually, too.
For such cases (or if you simply don't like to do the wrapping by yourself) we provide a
wrapping service for an additional fee which will build a wrapper package for a DLL provided
by you according to your needs as long as you can provide the necessary header file and / or
documentation to the DLL as well. If you're interested to make use of this wrapping service,
please contact us under service@DLLWrapper.com and attach some files (like header files
or documentation) that'll allow us to make a quote for wrapping the specific DLL interface that
you need.
Please note however, that we typically won't be able to test the wrapping DLL in any way as
we usually would need more than only the DLL to wrap but also the complete software and /
or hardware environment in which the DLL is supposed to run for this. Therefore the test of
the wrapping DLL is never part of our wrapping service but your responsibility - if you'll find
bugs during your test (which can't be ruled out because no tests can't be run by us) and
inform us accordingly we'll provide a fixed version of the wrapping DLL as part of the
wrapping service until it is tested error-free by you. Finally, please be aware that it might not
be possible to wrap all DLL functions transparently - see the chapter "Limitations" for some
explanation. In such a case we'll try to provide the best possible work around...
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